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Does a double-thickness block wall with no cavity require wall ties? (UK)

I'm just about to start blockwork on a self-build garage extension. The walls are 2 rows of standard 7n blocks with no cavity between them. If there is no cavity, do they still need to have wall ties ...
James Drinkwater's user avatar
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Anyone have any idea what if anything is behind the concrete block walls?

I'm trying to mount a few hose reels around the house. I'm assuming next the main breaker and above the cable stuff should be good as there is drywall after the concrete block and I assume the wires ...
robl45's user avatar
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How to plug 1/2" diam. hole in 1950s South Florida cement block house wall from old ATT wiring [duplicate]

I'm ready to remove an old data wire/cable from ATT in a second bedroom. Doing so would leave a hole to the outside of the house. What could I use to plug it? The house is down south and is made of ...
Tanner1234's user avatar
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2 answers
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How to Remove Concrete Blocks

I have a few concrete blocks hard glued together to the garage floor to create a raised platform. What is the best/easiest way to remove this without damaging the floor? Any thoughts would be greatly ...
SAS2Python's user avatar
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1 answer
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Can you substitute one 3/8" rebar by three 1/4" rebars?

[This question is about constructing techniques in Brazil, so if anything is not clear or not properly worded, please let me know and/or suggest phrasing improvements] I am building the foundations ...
Luiz Cordeiro's user avatar
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Can I stain interior concrete block foundation walls?

I was planning on painting our basement block walls until I just recently learned of the problems painting concrete invites (mainly mold) from basement waterproofing professionals (Crawl Space Ninja, ...
J Wheeler's user avatar
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1 answer
75 views

Are these block foundation cracks problematic? [closed]

What steps should I take to address these cracks and how problematic are they? I am hoping to insulate and finish this exterior wall.
cmarker's user avatar
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1 answer
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How can I construct an outdoor concrete pad and retaining wall that will also work as a basement floor and foundation wall?

I know at least a few ways to pour a concrete pad for long term outdoor use. And I can build a retaining wall, poured or from cinder blocks (or from timber, but that's less relevant here). I am less ...
Sparr's user avatar
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Is gravel required under a concrete slab that is beneath a fence (not supporting it)?

I have a vinyl fence around the back of my house. The posts are already supported by cement. I want to create concrete forms in between the posts to cover the dirt so I don't have to deal with weeds ...
Merlin -they-them-'s user avatar
3 votes
2 answers
2k views

How can I pour a 20' x 20 ' slab on a slope?

What is the best way to pour a slab that is 20 ft x 20 ft but has a slope. The grade is 18 inches higher on one side
Chris Espi's user avatar
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Water in Basement After Heavy Rain

link to photos Hi everyone. I consistently have water in my basement on the Eastern wall of my house every time it rains heavily - 1.5 inches or more in a 24 hour period. The water seeps in through ...
AP64's user avatar
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How can I seal/stabilize crumbling concrete blocks from the 1930s?

This is a pillar supporting an enclosed porch roof on a 1930s Craftsman in Northeast US. The porch is usually unheated during winter but it is entirely enclosed and not subject to rain/snow. As you ...
bikeactuary's user avatar
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1 answer
144 views

Poured Concrete, blocks or something else for single detached step

Good Afternoon, I am redoing a patio at the front of our home and need some advice on how to handle a single step up to the existing front patio. Techo-Bloc calls for a pre-existing concrete step to ...
Russ W.'s user avatar
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2 answers
279 views

Suggestions for repairing disintegrating concrete blocks in garage?

Our garage has a row of filled concrete blocks that are tied to the foundations, upon which the sill plate is attached. One corner has begun to let in water, and the freeze/thaw cycles of our ...
stasch's user avatar
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2 answers
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How do I fill only the top two courses of an existing CMU wall with grout?

I have an existing CMU wall that is open on the top so you can see down through the holes to the bottom. I'm going to put a beam on top of it, and the structural engineer said I need to fill the top ...
John Long's user avatar
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How should I finish this basement wall?

House built in 1970 in climate zone 3. These basement walls were apparently finished twice, the second time with drywall and originally with just wood against the concrete blocks with plaster as ...
Ethan's user avatar
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1 answer
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Mildew at the base of exterior block wall

The back wall of my row house is made of uninsulated block with a cement coating that looks like stucco. There is mildew / mold on the wall at the ground level that has slowly been getting worse. The ...
ggroff's user avatar
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1 vote
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Should I tie cinderblock wall into existing poured foundation?

I have a walk-out basement with two garage doors. I'd like to remove these garage doors and fill in the gaps in the foundation, and then add one or two service doors in their place. I'm wondering if I ...
Ian Pringle's user avatar
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0 answers
396 views

How thick of an arched concrete slab needed for root cellar roof

We are building a 6' x 6' root cellar with a dirt floor and concrete block walls. The walls will be on 16"w x 12"d concrete footings and 1/2" vertical rebar every 3rd hole. (~24" ...
Kurt's user avatar
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0 answers
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Reinforcing a Vertically Plumb Concrete Block Retaining Wall

I'm in the process of replacing a retaining wall that was supporting a small "flower bed" in the front of this house because it had started to lean to the point it was unsafe. Unfortunately, ...
Cody Smith's user avatar
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Thickness of concrete wall for deck construction

TL;DR: What thickness of a concrete wall underneath a deck should I go for? Is there any rule of thumb how to determine it? I am planning to build a deck next to my house. The house is in a mild hill ...
Topper Harley's user avatar
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New home foundation opening

We are having a new home built. Can you tell me why there’s several openings near the foundation? Is it suppose to look this way? How will the builder fix it? Can water get in and mess up the ...
Simone Stewart's user avatar
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2 answers
1k views

Is there any benefit to building framed walls inside concrete block walls?

I'm hoping to buy a place of my own soon. The house has walls made of concrete blocks, finished with plaster and paint. It looks great and doesn't need any changes. However, I've been thinking that I'...
Jibran's user avatar
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Corner of my house is missing with eroded concrete foundation. Is this quick fix enough?

Discovered this hole today in the corner of my cinder block foundation. Water is pooling there when it rains (another fix I need to do) but for now, I was going to chip out the loose piece, mix ...
podcastfan88's user avatar
3 votes
2 answers
109 views

Smallest width California residential code compliant below grade R-5 cement masonry wall assembly?

I'm in California, IBC climate zone 3B, California climate zone 8, very high termite area. I'm trying to determine the smallest width (for the total wall assembly) code compliant way to insulate (to R-...
gmbuell's user avatar
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What work is needed to resolve water issues related to this settling slab?

Summary of issue This house was built around 1960 on cinderblock foundation, and in 1980 an addition was built on an apparently-DIY concrete slab foundation. Part of that concrete slab extends beyond ...
cr0's user avatar
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1 vote
2 answers
5k views

How to best fill wall-plug holes in a concrete wall?

My landlord took out some monitor they had originally left attached to a wall in my rental apartment, and has now left me with a nice decorative set of wall plug holes. Assume for the sake of ...
einpoklum's user avatar
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1 vote
2 answers
74 views

Bottom wall getting dirty

I have an 8 foot retaining concrete wall. I painted it a few months ago, but it seems that when the water hits the soil it jumps back up and hits the bottom wall covering it in dirt. I was wondering ...
Rick's user avatar
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2 votes
0 answers
248 views

What is the best way to run a circuit over a 3' concrete block wall (for a baseboard thermostat)?

I'm installing a Mysa wifi line voltage thermostat to control an electic baseboard heater mounted against a concrete block wall. This is in a 2nd floor detached garage, and the 2 story structure was ...
chrispomeroy's user avatar
1 vote
0 answers
125 views

Sufficient Concrete Thickness for Table?

I'm planning on making a Concrete patio table. My plan is to make a 6ft x 3ft Concrete top. The frame will be 4 legs. I will have 3 aluminum angles running vertically underneath the length of the ...
G-J's user avatar
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Can a partition be built with 440 x 210 x 50mm 3.6N blocks? and How?

Can a 2.5 metre to ceiling by 2 metre wide internal partition be built with 440 x 210 x 50mm 3.6N block? and How? It will be supported either side onto existing wall and above and below. How does one ...
onepound's user avatar
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0 answers
313 views

Vinyl siding on concrete walls

I have to install vinyl siding on an exterior wall built from concrete blocks. Anyone have any tips on correctly weatherproofing and insulating? I was thinking to lay 3/4 EPS rigid insulation then 1/4 ...
Antonio Mezzapelle's user avatar
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1 answer
9k views

Florida footing depth

Could someone help me read this? Florida Building Code The structures on the left and right side will be new. Just outdoor multi purpose areas with fixed roofs. Left side for cooking (kitchenette)/ ...
lsiunsuex's user avatar
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1 vote
1 answer
333 views

Building a block wall up a steep slope

I would like to build a block wall up a steep slope, maybe 30%, and I don’t want to “stair step” the top, keeping it level, because it would render the wall nearly useless at the low points. If I have ...
kevin wells's user avatar
0 votes
1 answer
715 views

Sinking Garage Foundation Repair

My garage is attached to my home which is a single level ranch on a slab foundation. The garage has concrete blocks as footing along one wall. The garage floor is its own slab. Both the garage floor ...
DVCITIS's user avatar
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0 votes
3 answers
950 views

How to attach this wooden beam to concrete blocks

I want to attach a wooden beam to a hollow concrete block to use as one side of a washing line. How should I do that? Are there any attachments or fixings that I should use?
Craig's user avatar
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1 vote
1 answer
354 views

Best permanent female-thread anchor in block construction?

I'm helping a friend install hurricane panels over the windows in their house. These panels are 5/8"-thick extruded clear(ish) plastic sheets, dimensionally similar to 5/8" plywood. These ...
scottbb's user avatar
  • 111
6 votes
1 answer
739 views

Is this basement footer going to cause issues? [closed]

I'm having an addition put on my house with a full basement. The contractor poured the footer and is getting ready to do the foundation walls. He marked the lines for the walls, and I couldn't help ...
djs's user avatar
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3 votes
2 answers
2k views

How to Anchor to Top of CMU Cinder Block Wall?

I want to install a fence along the top of a retaining wall. The wall is made of standard 8x8x16 CMUs and is filled with 3500psi concrete and #4 rebar in every cell. The posts have 4"x4" ...
pennstump's user avatar
  • 223
-1 votes
1 answer
82 views

Does effective insulation of concreate block contribute more to energy efficiency in hot weather or cold weather [closed]

I am building a grout filled CMU house in the Ozarks. I have limited funds at this point and so I would like to focus my budget on thermal control where it will be needed most (i.e. heating / cooling)....
Michael M's user avatar
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0 votes
0 answers
666 views

How to get retaining blocks with a set end angle

I am trying to section off hexagonal areas in my yard. My initial thought was to get those trapezoidal blocks you can use to build retaining walls (Home Depot refers to them as Retaining Wall Blocks), ...
Tesset's user avatar
  • 101
2 votes
1 answer
220 views

Resources for extreme DIY'er to build brick garage

I'm an experienced DIY'er here in the upper midwest of the United States and was planning on building my own stick built 16x24 foot detached garage this fall 2021 or spring 2022. As we all know, the ...
Fuffer's user avatar
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5 votes
4 answers
4k views

How to put a clean hole in concrete block?

I am building a brick wall from concrete blocks. Note that these concrete blocks just provide a facade, don't hold any weight except an additional layer of same bricks above them. The blocks are 4&...
Village's user avatar
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2 votes
2 answers
9k views

Lateral force on posts resting on concrete deck blocks

I am building a floating deck that is not attached to the house and is 2ft in height. The 4x4 posts are inserted into and resting on top of a concrete decking block. The post is just sitting inside ...
markp64's user avatar
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0 votes
1 answer
33 views

What is N/mm² in block characteristics?

In brick/block datasheet I found strength parameter in N/mm². Does it mean how much weight can a brick hold? So, for example 10 N/mm² of 10x10cm brick could hold 100.000N ~ 10 tons? Is this correct? ...
Ri Di's user avatar
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3 votes
3 answers
3k views

Should the high side of a concrete block retaining wall be sealed?

I am mid-project in a DIY yard project. I have subbed out a large retaining wall to a civil / wall contractor. It’s 220 feet long, between 2-5′ in height, and makes 2 90-degree turns. It’s built to ...
pennstump's user avatar
  • 223
2 votes
0 answers
1k views

Help modifying window opening. American Concrete Institute standards? Building code?

I'm remodeling my kitchen and part of the work that I want to do involves modifying my window rough openings. Currently, the windows in my kitchen are lower than the countertop backsplash and I want ...
skyler's user avatar
  • 121
1 vote
1 answer
1k views

What concrete type should I use for a pizza oven base slab?

I am building a pizza oven and kitchen area in my garden. I am trying to work out if there is a specific type of concrete I need. My question is only about the concrete slab (the foundation). The slab ...
MyDaftQuestions's user avatar
1 vote
1 answer
345 views

How to prepare the ground before laying concrete

I am building a pizza oven and kitchen area in my garden. I am trying to work out how to lay a 2m*2m concrete slab. My calculation for the weight (that the concrete slab needs to support) are Dense ...
MyDaftQuestions's user avatar
0 votes
1 answer
287 views

Building a retaining wall with dense concrete blocks, best way to lay each course?

I've seen a few walls that use the top method versus the more common stretcher/running bond, are there any benefits to doing it the first way?
Fony Tinlay's user avatar